Creatinine clearance requires a timed urine sample. All the urine you have passed within a specific time period — usually hours — is saved collected in a container and tested.
The result shows how much creatinine has passed through your kidneys into your urine. It helps show how well your kidneys are removing the waste products from your blood.
There is help! Learn more about kidney disease and what you can do to stay healthy and prevent the progression of kidney disease here. Two simple tests for kidney disease. Skip to main content. You are here Home » A to Z » Creatinine. Taking blood from some people may be more difficult than from others. Other risks associated with having blood drawn are slight but may include:. Landry DW, Bazari H. Approach to the patient with renal disease.
Goldman-Cecil Medicine. Philadelphia, PA: Elsevier; chap Oh MS, Briefel G. Evaluation of renal function, water, electrolytes, and acid-base balance.
St Louis, MO: Elsevier; chap The information provided herein should not be used during any medical emergency or for the diagnosis or treatment of any medical condition. A licensed physician should be consulted for diagnosis and treatment of any and all medical conditions. Call for all medical emergencies. Links to other sites are provided for information only -- they do not constitute endorsements of those other sites. A standard blood test is used to measure creatinine levels in your blood serum creatinine.
Your doctor may ask you not to eat fast overnight before the test. For a creatinine urine test, you may need to collect urine over 24 hours in containers provided by the clinic.
For either test, you may need to avoid eating meat for a certain period before the test. If you take a creatine supplement, you'll likely need to stop use. For a serum creatinine test, a member of your health care team takes a blood sample by inserting a needle into a vein in your arm. Results from creatinine in blood or urine are measured and interpreted in many ways, including the following:. Creatinine usually enters your bloodstream and is filtered from the bloodstream at a generally constant rate.
The amount of creatinine in your blood should be relatively stable. An increased level of creatinine may be a sign of poor kidney function. The typical range for serum creatinine is:. The measure of serum creatinine may also be used to estimate how quickly the kidneys filter blood glomerular filtration rate. For the next 24 hours, save all your urine passed in the container provided. Store your urine container in the refrigerator or a cooler with ice.
Return the sample container to your health provider's office or the laboratory as instructed. Will I need to do anything to prepare for the test? Are there any risks to the test? There is no risk to having a urine test. What do the results mean? These include: Autoimmune diseases Bacterial infection of the kidneys Blocked urinary tract Heart failure Complications of diabetes But abnormal results don't always mean kidney disease.
The following conditions can temporarily raise creatinine levels: Pregnancy Intense exercise A diet high in red meat Certain medicines. Some medicines have side effects that raise creatinine levels. If you have questions about your results, talk to your health care provider. Is there anything else I need to know about a creatinine test? References Hinkle J, Cheever K.
Creatinine, Serum; p. Hinkle J, Cheever K. Creatinine, Urine; p. Kids Health from Nemours [Internet]. Urine Test: Creatinine; [cited Aug 28]; [about 3 screens].
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